Question

tính nhanh:

214 + [ 120 - ( 214 +120)]

Answer 1

214 + [ 120 - ( 214 +120)]

=214 + [ 120 - 334 ]

= 214 + ( - 214 )

=0

thử nhiệm 

Answer 2

tính nhanh:

214 + [ 120 - ( 214 +120)]

=214 +  120 - ( 214 +120)

=214 +  120 - 214 -120

=214 - 214 +  120 -120

=0

Answer 3

=214 + [ 120 - 334]

= 214 + (- 106 )

=  8

Answer 4

214+[120-(214+120)]

=214+120-214-120

=(214-214)+(120-120)

=0+0

=0